Everything in the universe is made of matter. Matter is anything that occupies space and has mass. Mass is the quantity of matter an object has. Mass and weight are not the same; weight is defined as the force produced by gravity acting on mass. The same mass would have less weight on the moon than it would on Earth because the moon exerts less force on the object than the Earth does.

Chemical changes in matter are essential to all life processes. Biologists study chemistry because all living things are made of the same kinds of matter that make up nonliving things. By learning how changes in matter occur, you will gain an understanding of the life processes of the organisms you will study.

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